.bottom-picker-mask {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: rgba(0,0,0,0.4);
}
.bottom-picker-content {
  width: 100%;
  bottom: 0;
  left: 0;
  min-height: 200px;
  background-color: #fff;
  position: absolute;
} 

.bottom-picker-title {
  display: block;
  width: 100%;
  text-align: center;
  padding: 20px 0px;
  font-size: 16PX;
  color: #999;
}